import fetch from 'dva/fetch';
import {message, notification} from 'antd';
import router from 'umi/router';
import hash from 'hash.js';
import {isAntDesignPro} from './utils';

const codeMessage = {
    200: '服务器成功返回请求的数据。',
    201: '新建或修改数据成功。',
    202: '一个请求已经进入后台排队（异步任务）。',
    204: '删除数据成功。',
    400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
    401: '用户没有权限（令牌、用户名、密码错误）。',
    403: '用户得到授权，但是访问是被禁止的。',
    404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
    406: '请求的格式不可得。',
    410: '请求的资源被永久删除，且不会再得到的。',
    422: '当创建一个对象时，发生一个验证错误。',
    500: '服务器发生错误，请检查服务器。',
    502: '网关错误。',
    503: '服务不可用，服务器暂时过载或维护。',
    504: '网关超时。',
};

const checkStatus = response => {
    if (response.status >= 200 && response.status < 300) {
        return response;
    }

    if (response.status != 401 || location.pathname.endsWith("/user/login")) {
        const errortext = codeMessage[response.status] || response.statusText;
        notification.error({
            message: `请求错误 ${response.status}: ${response.url}`,
            description: errortext,
        });
        const error = new Error(errortext);
        error.name = response.status;
        error.response = response;
        throw error;
    } else {
        window.g_app._store.dispatch({
            type: 'login/logout',
        });
    }
};

const cachedSave = (response, hashcode) => {
    /**
     * Clone a response data and store it in sessionStorage
     * Does not support data other than json, Cache only json
     */
    const contentType = response.headers.get('Content-Type');
    if (contentType && contentType.match(/application\/json/i)) {
        // All data is saved as text
        response
            .clone()
            .text()
            .then(content => {
                sessionStorage.setItem(hashcode, content);
                sessionStorage.setItem(`${hashcode}:timestamp`, Date.now());
            });
    }
    return response;
};

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [option] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, option) {
    const options = {
        expirys: isAntDesignPro(),
        ...option,
    };
    /**
     * Produce fingerprints based on url and parameters
     * Maybe url has the same parameters
     */
    const fingerprint = url + (options.body ? JSON.stringify(options.body) : '');
    const hashcode = hash
        .sha256()
        .update(fingerprint)
        .digest('hex');

    const defaultOptions = {
        credentials: 'include',
    };
    const newOptions = {...defaultOptions, ...options};
    if (
        newOptions.method === 'POST' ||
        newOptions.method === 'PUT' ||
        newOptions.method === 'DELETE'
    ) {
        if (!(newOptions.body instanceof FormData)) {
            newOptions.headers = {
                Accept: 'application/json',
                'Content-Type': 'application/json; charset=utf-8',
                ...newOptions.headers,
            };
            newOptions.body = JSON.stringify(newOptions.body);
        } else {
            newOptions.headers = {
                Accept: 'application/json',
                ...newOptions.headers,
            };
        }
    }
    const token = sessionStorage.getItem('MYRCIB_USER_TOKEN'); //SubCookieUtil.getCookie("TXR_USER_TOKEN");

    // if(token){
    //   newOptions.headers.TXR_USER_TOKEN = token;
    // }
    if (token) {
        newOptions.headers = {
            MYRCIB_USER_TOKEN: token,
            ...newOptions.headers,
        };
    }

    const expirys = options.expirys && 60;

    if (options.expirys !== false) {
        const cached = sessionStorage.getItem(hashcode);
        const whenCached = sessionStorage.getItem(`${hashcode}:timestamp`);
        if (cached !== null && whenCached !== null) {
            const age = (Date.now() - whenCached) / 1000;
            if (age < expirys) {
                const response = new Response(new Blob([cached]));
                return response.json();
            }
            sessionStorage.removeItem(hashcode);
            sessionStorage.removeItem(`${hashcode}:timestamp`);
        }
    }

    return fetch(url, newOptions)
        .then(checkStatus)
        .then(response => cachedSave(response, hashcode))
        .then(response => {
            if (response.status === 204) {
                return response.text();
            }
            return response.json();
        })
        .catch(e => {
            const status = e.name;

            if (status === 403) {
                router.push('/exception/403');
                return;
            }

            if (status <= 504 && status >= 500) {
                message.error('系统异常');
                return;
            }
            if (status >= 404 && status < 422) {
                router.push('/exception/404');
            }
        });
}
